If you don't have fresh yeast around, you can make this dough with instant yeast. You should use 1/3 the amount, which is 1 gram. For a version that does not require refrigeration, use 20 g fresh yeast or 1 tsp instant yeast. Instead of letting the dough in the fridge over night, let it rise at room temperature until doubled in size. This should take about 60 to 90 minutes.